18507984647 has 2 divisors, whose sum is σ = 18507984648. Its totient is φ = 18507984646.

The previous prime is 18507984641. The next prime is 18507984709. The reversal of 18507984647 is 74648970581.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18507984647 - 2⁴ = 18507984631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18507984641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9253992323 + 9253992324.

It is an arithmetic number, because the mean of its divisors is an integer number (9253992324).

Almost surely, 2^18507984647 is an apocalyptic number.

18507984647 is a deficient number, since it is larger than the sum of its proper divisors (1).

18507984647 is an equidigital number, since it uses as much as digits as its factorization.

18507984647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13547520, while the sum is 59.

The spelling of 18507984647 in words is "eighteen billion, five hundred seven million, nine hundred eighty-four thousand, six hundred forty-seven".